Dux heat pump fault-code guide

Dux gives unusually direct identification guidance: its warranty section says the serial and model number are on the compliance plate on the outside of the water heater. Record the entire code, including DHC or DHB, the capacity digits, P, and any trailing H. The captured manuals explain that H has a defined model meaning, so dropping it loses source information even where a controller family is shared. Keep the plate unobstructed and photograph the installation-date evidence too; those details are requested if Dux needs to determine the warranty commencement date or arrange service.

Sources: Dux Ecosmart Heat Pump Installation and Owner’s Manual, H4149 Revision B, PDF page 39 · Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 51

The current evidence divides Ecosmart operation into two visible interfaces. The DHC manual describes its controller, a screen that auto-locks after inactivity, Wi-Fi connection, and Smart Life app status reporting. The Pro-Series manual documents a wired controller with a main display area for temperature, time, operating state, and error indications. Because an owner may first see a DHC error on a phone but a Pro-Series error on the appliance controller, always report where the message appeared. A screenshot and a plate photo prevent the interface namespace from being lost during a service conversation.

Sources: Dux Ecosmart Heat Pump Installation and Owner’s Manual, H4149 Revision B, PDF page 17 · Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 26

For DHC models, the captured source publishes six Smart Life app error rows on PDF page 31 and explains that the app indicates sensor failures. For the Ecosmart Pro-Series, thirteen controller-display rows appear on page 40 with corrective-action framing. These records are not merged: an app code belongs to the DHC app namespace, while a code shown on the Pro wired controller belongs to that display namespace. Use the exact raw characters from the interface and do not translate an app message into a similarly shaped Pro code without documentary evidence.

Sources: Dux Ecosmart Heat Pump Installation and Owner’s Manual, H4149 Revision B, PDF page 31 · Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 40

The DHC manual covers 200DHC25 and 300DHC25 families, including P and H forms named on its cover. The Pro-Series publication covers 270DHB36, 270DHC36, and their P variants. That is a documented controller split even though all units carry the Ecosmart name. The DHC evidence is app-centred and the Pro evidence is controller-display-centred; the fault lists also differ in size and page location. Other Dux registry models remain unmapped where no official scope statement connects their electronics to either family, regardless of a shared capacity number or product prefix.

Sources: Dux Ecosmart Heat Pump Installation and Owner’s Manual, H4149 Revision B, PDF page 1 · Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 1

Dux’s Australian aftersales page provides warranty registration and service booking, while its warranty page explains the claim information required. The official route asks for the serial number, model number, contact and address details, and proof of installation date. The warranty terms remain product- and component-specific, and the page warns that the owner can be responsible for costs where the reported issue is not covered. Submit the observed app or display code as evidence of the symptom, but let Dux or its service agent decide warranty status after assessment.

Sources: Dux aftersales and support · Dux warranty details

The captured Dux material publicly documents the named DHC and Pro-Series products, their different control surfaces, their visible error tables, and detailed warranty procedures. It does not state that older Ecosmart, Airoheat, or other Dux identifiers inherit either codeset. The manuals also separate owner observations from refrigerant, electrical and internal service work. This site consequently publishes the two verified namespaces and leaves unsupported models without code meanings. That restrained boundary is more useful than a broad Dux list because a technician receives the actual model, the correct interface, and a citation to the governing manual page.

Sources: Dux Ecosmart Heat Pump Installation and Owner’s Manual, H4149 Revision B, PDF page 32 · Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 41